P/N PM000223A • Rev. 1 • ISS 9 August 2017 17
Installation Manual
NU-Series Hardware
System Cabling
The splitter has three RJ-45 connections: one for the incoming hallway bus, one for the
connected device, and one for the outgoing hallway bus.
Figure 15 Connecting the hallway bus using the 3-way RJ-45 splitter
Legend:
(1) From previous hallway device or Gateway II
(2) To the next Hallway device
(3) To the device at this location
2.6 Active Room Bus
An active room bus is the communication system that transfers power, data, and speech
between a dome light, which controls the bus, and NU-series room module devices that
are connected to the bus.
An active room bus begins at a dome light. The dome light, which connects to a hallway
bus, is the interface that allows room modules to communicate with a Ascom Telligence
System. Each dome light contains two RJ-45 connectors, which distributes 5.5VDC power
and data communications to the attached room modules. Each dome light can support up
to sixteen room modules on its room bus. Room modules connect to the room bus via a
Cat5/5e/6/7 U/UTP cable.
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